AP Statistics Conditional Probability Review

P(Freshman or Pizza):

• 27/50

• 4/50

• 3/50

• 2/11

P(Sandals):

• 16/22

• 20/36

• 5/9

• 20/16

If A and B are mutually exclusive, which statement below must be true?

• P(A∩B) = 0

• P(A|B) = 0

• P(A∪B) = 0

• P(A) + P(B) = 1

If A and B are independent, which statement must be true?

• P(A∩B) = 0

• P(A|B) = P(A)

• P(A∪B) = 0

• P(A) + P(B) = 1

When picking two cards from a pack (without putting the first one back) the two outcomes are:

• Dependent

• Independent

What is P(T given C)?

• 45%

• 29.6%

• 40%

• 33.3%

In an AP Statistics class, 57% of students eat breakfast in the morning, 80% of them floss their teeth, and 46% of the students do both.  What is the probability that a randomly chosen student eats breakfast or flosses their teeth?

• 91%

• 9%

• 11%

• 34%

In an AP Statistics class, 57% of students eat breakfast in the morning, 80% of them floss their teeth, and 46% of the students do both.  What is the probability that a randomly chosen student eats breakfast but does not floss their teeth?

• 9%

• 11%

• 34%

• 91%

Five juniors and four seniors have applied for two open student council positions, and administrators have decided to pick two new members randomly.  What is the probability that they are both from the same grade?

• .395

• .444

• .506

• .569

Pepsi is running a sales promotion in which 12% of all bottles have a "FREE" logo under the cap.  If you buy a 6-pack of bottles, what is the probability that you will find at least 1 "FREE" logo?

• .464

• .536

• .12

• 0